@article{78e96ee1d8004591996eac7f3ebc3fc9,
title = "Formation mechanism and stability of austenitic islands in carbides in a Ni-Cr-Fe based high-temperature austenitic alloy undergoing carburization",
abstract = "We investigate a phase transformation in a Ni-Cr-Fe-based high-temperature alloy during the technologically important carburization process, with multi-length scale experimental techniques. The study focuses on the formation and stability of novel austenitic islands formed within carbide structures during the M23C6 to M7C3 phase-transformation. We demonstrate that the austenitic islands nucleate near the M23C6/M7C3 transformation front, from a supersaturation of metal atoms in the M23C6-carbide as M7C3 grows. After formation, the austenitic islands equilibrate their composition with the matrix temporally but remain relatively stable inside the carbides due to their large sizes (a few hundred nanometers in diameter) and a weak Gibbs-Thomson effect.",
keywords = "Analytical electron microscopy, Atom-probe tomography, Dual-beam FIB tomography, High-temperature alloys, Phase transformation",
author = "Shipeng Shu and Xiaobing Hu and Maryam Kazemzadeh-Atoufi and Tao Liu and Anyu Shang and Davis, {Mark B.} and Robin Ziebarth and Sandeep Dhingra and Morgan, {Robert D.} and Yao Du and Voorhees, {Peter W.} and Seidman, {David N.}",
note = "Funding Information: This research was supported by Dow Chemical Company's University Partnership Initiative. This work made use of the EPIC facility of Northwestern University's NUANCE Center, which has received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS-1542205); and the MRSEC program (NSF DMR-1720139) at the Materials Research Center. The LEAP tomograph at NUCAPT was purchased and upgraded continuously with grants from the NSF-MRI program (DMR-0420532) and ONR-DURIP program (N00014-0400798, N00014-0610539, N00014-0910781, N00014-1712870) programs. Atom-probe tomography was performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT). NUCAPT received support from the MRSEC program (NSF DMR-1720139) at the Materials Research Center, the SHyNE Resource (NSF ECCS-1542205), and the Initiative for Sustainability and Energy (ISEN) at Northwestern University. The authors thank Dr. Qingqiang Ren of Northwestern University, currently at Oak Ridge National Laboratory, for valuable discussions. Publisher Copyright: {\textcopyright} 2021 Acta Materialia Inc.",
year = "2021",
month = may,
doi = "10.1016/j.scriptamat.2021.113792",
language = "English (US)",
volume = "197",
journal = "Scripta Materialia",
issn = "1359-6462",
publisher = "Elsevier Limited",
}